A CT scanner, or computed tomography scanner, is a medical imaging device that uses X-rays to create detailed pictures of the inside of the body. It takes multiple X-ray images from different angles and combines them using computer technology to produce cross-sectional views, or "slices," of organs and tissues. This helps doctors diagnose various conditions, such as tumors or internal injuries. The CT scanner is often used in hospitals and clinics because it provides quick and accurate results. Patients typically lie on a table that moves through a large, doughnut-shaped machine, making the process fast and painless.